JP2017009927A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain simplicity when a display device is worn or unworn, and to reduce a load to a nose or ears of a person when he/she wears it regardless of individual differences of head shapes.SOLUTION: A display device includes: an image display part 30 displaying an image; a housing 40 for supporting the image display part 30 in front of user's eyes when the user wears it; and a temple 50 that has a bendable multi-joint structure, has one end connected to the housing 40, comes into contact with temporal regions of the user, and is provided in a pair of right and left sides with predetermined spaces. The temple 50 has: a plurality of joints; a plurality of arms connected through the joints; and a plurality of leaf springs for applying constant loads to bends caused by the joints.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a display device.

  Conventionally, there is a head-mounted display that is mounted on the user's head and displays image information such as video to the user. Among them, an eyeglass-type display having a display unit in front of the user's eyes and having a temple, a nose pad, and an ear pad has a structure in which an image display unit, a drive circuit, and a light source for display are arranged in front of the eyes and the front is heavy. The load on the nose is extremely high. For this reason, when the spectacles type display is worn for a long time, the vicinity of the nose pad may be inflamed red and pain may occur.

  In view of this, for example, a head mountain display that reduces the burden on the user by devising the structure of the temple and reducing the weight of the cable attached to the glasses-type display has been disclosed (see Patent Document 1). Further, for example, a portable display device that reduces the load on the nose by attaching a frame that is fixed to the periphery of the head to a glasses-type housing that accommodates a display device or the like is disclosed (Patent Document 2). reference).

  However, in the head mountain display of Patent Document 1 described above, the load on the nose due to the weight of the display unit itself cannot be reduced. Further, in the portable display device of Patent Document 2, even if the load on the nose can be reduced, the above-mentioned frame causes the head to be tightened more strongly, or the presence of the frame causes the head of the glasses-type display. There was a problem that it would be difficult to attach to and detach from. Furthermore, although there are individual differences in the shape of the head, in the conventional structure, there are individual differences in the effect when the spectacles type display is worn.

  The present invention has been made in view of the above, and obtains a display device that maintains the ease of attachment and detachment and reduces the load on the nose and ears when worn regardless of individual differences in head shape. For the purpose.

  In order to solve the above-described problems and achieve the object, the display device of the present invention includes an image display unit that displays an image, and a support that supports the image display unit in front of the user's eyes when worn by the user. A member, and one end portion connected to the support member, and a pair of left and right temples provided at a predetermined interval. The temple includes a plurality of joint portions and a plurality of joint portions connected by the joint portions. It has an arm part and a plurality of constant load parts which apply a constant load to bending by the joint part.

  According to the present invention, it is possible to maintain the simplicity of attachment and detachment and to reduce the load on the nose and ears when worn regardless of individual differences in head shape.

FIG. 1 is a side view showing an outline of a glasses-type display. FIG. 2 is a diagram illustrating the configuration of the image projection optical unit and the image display unit. FIG. 3 is a diagram illustrating a state in which the glasses-type display illustrated in FIG. 1 is mounted on the user's head. FIG. 4 is a diagram illustrating an example of an MRI image of a human head. FIG. 5 is an explanatory diagram of a human head. FIG. 6 is a schematic diagram in which an eyeglass-type display is mounted on the head with respect to the average head size of the Japanese adult male shown in FIG. FIG. 7 is a diagram illustrating an example of the temple (right side) of the present embodiment. FIG. 8 is a schematic diagram when the eyeglass-type display with the temple of this embodiment attached is mounted on the head. FIG. 9 is a schematic diagram when a glasses-type display is mounted on the head having a shape that is 10% smaller than the head shape shown in FIG. FIG. 10 is a schematic diagram when a glasses-type display is mounted on a head having a shape that is 10% larger than the head shape shown in FIG. FIG. 11 is a view showing a change in angle before and after mounting at the joint portions a1 to a4 of the temple. FIG. 12 is a diagram illustrating the load results of the contact points c1 to c4 in the temple to which the flat plate spring is attached for each head shape. FIG. 13 is a diagram showing a specific configuration of the temple of the present embodiment. FIG. 14 is a view showing the structure of the leaf spring of this embodiment. FIG. 15 is a diagram showing a cross-sectional shape when the leaf spring of this embodiment is bent in the convex direction. FIG. 16 is a diagram showing a cross-sectional shape when the leaf spring of this embodiment is bent in the concave direction. FIG. 17 is a diagram showing loads when the bending angle of the leaf spring of this embodiment is shallow and deep. FIG. 18 is a view showing a cross-sectional structure in which a portion of the range V of the temple shown in FIG. FIG. 19 is a diagram illustrating a load on the nose of the glasses-type display in the comparative example. FIG. 20 is a diagram illustrating a design of a leaf spring used in the first embodiment. FIG. 21 is a diagram illustrating a measurement result of a load applied to the head when the temple of Example 1 is used. FIG. 22 is a diagram illustrating a load on the nose of the eyeglass-type display according to the first embodiment. FIG. 23 is a diagram illustrating a design of a leaf spring used in the second embodiment. FIG. 24 is a diagram illustrating a measurement result of a load applied to the head when the temple of Example 2 is used. FIG. 25 is a diagram illustrating a load on the nose of the glasses-type display according to the second embodiment.

  Hereinafter, embodiments of a display device will be described in detail with reference to the accompanying drawings. In the present embodiment, an example in which the display device is applied to a glasses-type display is shown.

  First, the glasses-type display will be described. FIG. 1 is a side view showing an outline of a glasses-type display. As shown in FIG. 1, the glasses-type display 10 includes an image projection optical unit 20, an image display unit 30, a housing 40, a temple 50, a nose pad 60, and an ear pad 70. The temple 50, the nose pad 60, and the ear pad 70 are provided as a pair on the left and right. FIG. 2 is a diagram illustrating the configuration of the image projection optical unit and the image display unit.

  The image projection optical unit 20 is an optical unit that projects an image onto the image display unit 30. As shown in FIG. 2, the image projection optical unit 20 includes a light source 22 for projecting image information onto an image display unit 30, a liquid crystal panel 24 that projects an image based on the image information, and an optical lens group 26 that adjusts the optical axis. It consists of and.

  The image display unit 30 displays an image corresponding to the image information. Specifically, as shown in FIG. 2, the image display unit 30 projects an image on the retina of the user's eyeball 5, and includes an optical waveguide 32 having a triangular prism formed with an antireflection film. . The light derived from the image projecting optical unit 20 is refracted by the triangular prism and is refracted by the other triangular prism while being totally reflected several times in the optical waveguide 32, and an image is projected onto the eyeball 5. As shown in FIG. 1, a nose pad 60 projects from the image display unit 30.

  In FIG. 2, the light path while being totally reflected is omitted and described as one straight line. Further, the image display unit 30 shown in the present embodiment is shown as an example of a configuration that displays an image on both eyes, but may be configured to display an image only on one eye.

  The housing 40 supports the image projection optical unit 20 and the image display unit 30 in front of the user's eyes when the eyeglass-type display is attached to the user.

  The temple 50 is a member that attaches the eyeglass-type display 10 to the head when one end is connected to the housing 40 and the vicinity of the other end is put on the ear via the user's temple. The temples 50 are provided in a pair of left and right at a predetermined interval so as to come into contact with the user's temporal region.

  The temple 50 holds the image projection optical unit 20 and the image display unit 30 via a housing 40 that supports them. In addition, an ear pad 70 that is an earpiece portion is attached to the other end of the temple 50.

  FIG. 3 is a diagram illustrating a state in which the glasses-type display illustrated in FIG. 1 is mounted on the user's head. As shown in FIG. 3, the eyeglass-type display 10 is held (fixed) on the head 1 by a nose pad 60 and an ear pad 70 with the nose part and the ear part as support points (P1, P2). Note that the center of gravity G indicates the position of the center of gravity of the glasses-type display 10.

  Here, the amount of light from the light source 22 is attenuated by the square of the distance. For this reason, the distance between the image projection optical unit 20 and the image display unit 30 should be as short as possible. In the glasses-type display 10, the image projection optical unit 20 is arranged in front of the glasses-type display 10. For this reason, as shown in FIG. 3, the center of gravity G of the glasses-type display 10 is located near the nose.

  Therefore, of the weight of the glasses-type display 10, the load ratio to the nose is 80% to nearly 90%. For example, when the weight of the glasses-type display 10 is 40 g for a single-eye type and 100 g for a binocular type, the load on the nose is between 30 g and 40 g for a single-eye type and between 80 g and 90 g for a binocular type. Become. For this reason, wearing a glasses-type display for a long time may damage the nose.

  FIG. 4 is a diagram illustrating an example of an MRI image of a human head. FIG. 5 is an explanatory diagram of a human head. Referring to the image of the head 1 shown in FIG. 4, as shown in FIG. 5, the shape of the human head 1 can be substituted by a combination of a circle and a trapezoid.

  As shown in FIG. 5, the average head size of Japanese adult males is 160mm for the head width W1 that determines the diameter of the circle, 189mm for the head length D1 that determines the total length of the circle and trapezoid, The width W2 between the tragus closest to the width is 148 mm, the distance D2 from the base of the ear to the temple is 36 mm, and the distance D3 from the temple to the forehead is about 74 mm.

  FIG. 6 is a schematic diagram in which an eyeglass-type display is mounted on the head with respect to the average head size of the Japanese adult male shown in FIG. FIG. 6A shows the shape of the temple before the spectacles type display is mounted. FIG. 6B shows the deformation of the temple when the glasses-type display is mounted on the head.

  The temple 50 shown in FIG. 6 is generally formed of an elastic resin or a thin metal plate, is connected to the housing 40, and abuts on the temporal region near the user's ear. For this reason, the eyeglass-type display as shown in FIG. 6 is supported only in the vicinity of the nose and ears, and a load is applied to the nose and ears.

  In order to solve such extreme load imbalance near the nose, the temple attached to the glasses-type display of this embodiment has a Y-shape with a bendable articulated structure and is provided in a pair of left and right. ing. FIG. 7 is a diagram illustrating an example of the temple (right side) of the present embodiment. When the eyeglass-type display of this embodiment is mounted on the head, the temple shown in FIG. 7 is located on the right side of the head. Note that the glasses-type display to which the temples of the present embodiment are attached includes an image projection optical unit 20, an image display unit 30, and a housing 40 that supports them, similarly to the glasses-type display shown in FIG. I have. Further, the temple shape on the left side is a shape in which the temple shape shown in FIG.

  In the temple 100 of the present embodiment, one of the Y-shaped ends is connected to the housing 40 that supports the image projection optical unit 20 and the image display unit 30 and abuts on the user's temporal region. A pair of left and right is provided at such a predetermined interval. The temple 100 abuts from the vicinity of the user's temple to the vicinity of the back of the head to reduce the load on the nose. Hereinafter, a specific structure of the temple 100 of the present embodiment will be described with reference to FIG.

  Fig.7 (a) has shown the shape of the temple of embodiment. The temple 100 is a multi-joint structure having a plurality of joint portions, and in this embodiment, as shown in FIG. 7A, the four joint portions a1, a2, a3, a4 (a1 to a4) that can rotate. ) Is provided.

  FIG. 7B is an exploded view of the temple shown in FIG. The temple 100 has a plurality of arm portions connected by joint portions. In the present embodiment, as shown in FIGS. 7A and 7B, the arm portions 102 and 104 connected by joint portions a1 to a4. , 106 and 108 are provided. Moreover, as shown to Fig.7 (a), the temple 100 of this embodiment is assembled | attached to the Y shape by the joint part. The joint portion a1 is connected to the housing 40.

  FIG. 8 is a schematic diagram when the eyeglass-type display with the temple of this embodiment attached is mounted on the head. In FIG. 8, the left side and the display unit in FIG. 6 are omitted, and the right case 40 and the temple 100 are shown. FIG. 8A shows the shape of the temple before the spectacles type display is mounted. FIG. 8B shows the deformation of the temple when the spectacles type display is mounted on the head 1.

  When a spectacle-type display attached with the temple 100 having the shape shown in FIG. 8A is attached to the head 1, the arms 102, 104, 106, and 108 are rotated by the joints a1 to a4, and the head from the temple to the back of the head is rotated. By deforming along the shape of the part, the contact points c1, c2, c3, and c4 come into contact with the head uniformly.

  Next, a description will be given of a case where a spectacle-type display in which the temple 100 of the present embodiment is attached to a head having a shape smaller than that of an average Japanese adult male and a head having a large shape. .

  FIG. 9 is a schematic diagram when a glasses-type display is mounted on the head having a shape that is 10% smaller than the head shape shown in FIG. FIG. 9 assumes a head of a woman or a child, for example. FIG. 9A shows the shape of the temple before the spectacles type display is mounted. FIG. 9B shows deformation of the temple when the spectacles type display is mounted on the head 2.

  Even when the spectacles-type display attached with the temple 100 having the shape of FIG. 9A is attached to the head 2, the arm portions 102, 104, 106, and 108 rotate at the joint portions a1 to a4 as in FIG. From the temple to the back of the head, the head deforms along the shape of the head and uniformly contacts the head.

  FIG. 10 is a schematic diagram when a glasses-type display is mounted on a head having a shape that is 10% larger than the head shape shown in FIG. FIG. 10 assumes, for example, an obese and large male head. FIG. 10A shows the shape of the temple before the spectacles type display is mounted. FIG. 10B shows the deformation of the temple when the spectacles type display is mounted on the head 3.

  Even if the spectacles-type display attached with the temple 100 having the shape shown in FIG. 10A is attached to the head 3, the arm portions 102, 104, 106, and 108 rotate at the joint portions a1 to a4 as in FIG. From the temple to the back of the head, the head deforms along the shape of the head and uniformly contacts the head.

  In this way, when the glasses-type display is mounted on the head 1, in order for the deformed temple 100 to be in contact with the head uniformly from the temple to the back of the head, the temple 100 should not be displaced from the head 1. It is necessary to apply a predetermined pressure to the head 1 at the contact portion.

  In order for each arm part (arm part 102, 104, 106, 108) of the temple 100 that is in contact to apply a predetermined pressure to the head 1, a force is applied to the arm part in each joint part (joint part a1 to a4). A mechanism for generating the above is required. It is conceivable to provide a torsion spring or a leaf spring as an elastic member for this purpose.

  Here, the angle change before and after mounting | wearing by the joint parts a1-a4 of the temple 100 at the time of mounting | wearing the head with the spectacles type display of this embodiment is demonstrated. FIG. 11 is a view showing a change in angle between before and after mounting at the joint portions a1 to a4 of the temple 100. FIG.

  Here, in FIG. 11, the head shape (see FIG. 8) of the average Japanese adult male is “standard shape”, and the head is 10% smaller than the head shape of the average Japanese adult male. The shape (see FIG. 9) is referred to as “10% smaller shape”, and the shape that is 10% larger than the average Japanese adult male head shape (see FIG. 10) is referred to as “10% larger shape”. The same applies to the following FIG. 12, FIG. 21, and FIG.

  In FIG. 11, the horizontal axis represents the joints a1 to a4 and the vertical axis represents the angle, and the angle change before and after the spectacles-type display is mounted at each joint of the joints a1 to a4 of the temple 100 of the present embodiment. , For each head shape. As shown in FIG. 11, it can be seen that the angle change of the joint portions a1 to a4 is the largest at the joint portion a2, and the angle change amount is large depending on the head shape.

  Here, a case where a flat leaf spring is used for the joint portions a1 to a4 in order to generate pressure on the arm portions 102, 104, 106, and 108 will be described. FIG. 12 is a diagram illustrating the load results of the contact points c1 to c4 in the temple to which the flat plate spring is attached for each head shape.

  In FIG. 12, it is flat so that a desired load of 0.2 N is generated at the contact points c1 to c4 with the angle change shown in FIG. 11 with respect to the standard shape (the average head shape of an adult Japanese male man). It is a load result in contact point c1-c4 of 10% small shape when a spring constant of a face plate spring is changed, a standard shape, and a 10% large shape.

  As shown in FIG. 12, in the case of the standard shape, a desired 0.2N is applied to the contact points c1 to c4, but in the case of a shape that is 10% smaller, there is not enough load at the contact points c1, c2, and c4, The temple 100 cannot be supported well by the back of the head. In the case of a shape that is 10% larger, a load greater than 0.2N is applied at the contact points c1 and c3, and there is a risk of pain in the temples and the back of the head.

  Here, the load value 0.2N applied to the head at each contact point is a load sufficient to support the head without causing pain or discomfort even when a load is applied for a long time. Furthermore, if it is in the range of approximately 0.15N to 0.3N, there will be no pain or discomfort even when a load is applied for a long time, and the load will be sufficient to support the head.

  In this way, if a force is generated in the arm portion using a torsion spring or a flat plate spring, the temple deforms along the head shape, but if the head shape is different, the load at each contact point is different. There is a risk that the temples will not be evenly worn and the temples may be incompletely supported or the temples may be painful.

  Therefore, in this embodiment, even if the angles of the joint portions a1 to a4 are changed, a constant load load mechanism (constant load load portion) in which a constant load (constant load) is always applied to the arm portions 102, 104, 106, and 108. Thus, even when the shape of the head on which the spectacle-type display is mounted changes, the load at the contact point can always be kept constant.

  The constant load load in the present embodiment indicates a load load in which the applied load is always constant even when the bending angle or the displacement amount changes. For example, in the case of a torsion spring, the force generated by the spring is constant even if the torsion angle of the spring is changed. In the case of a leaf spring, the force generated in the spring is constant even if the deflection amount of the leaf spring is changed. Means that.

  FIG. 13 is a diagram showing a specific configuration of the temple of the present embodiment. As described above, the temple 100 of the present embodiment has a Y-shape with a bendable articulated structure. FIG. 13A is a diagram showing a framework shape of the temple 100. FIG. 13B is a diagram specifically showing a cross-sectional structure of the temple 100. FIG.13 (c) is a bird's-eye view of the range V in FIG.13 (b).

  In the temple 100 shown in FIG. 13, a constant load is applied to the joint portions a1 to a4. Specifically, first, as shown in FIGS. 13B and 13C, the arm portions 102, 104, 106, and 108 are box-shaped. Further, the joint portions a1 to a4 have a rotatable rotation shaft, and leaf springs S1 to S4 that are applied with a constant load (a constant load) are wound around the rotation shaft even if the bending angle changes. . Angle fixing members 112, 114, 116, and 118 that maintain the leaf springs S <b> 1 to S <b> 4 at a predetermined angle with respect to the arm portions 102, 104, 106, and 108 are provided.

  Moreover, as shown in FIG.13 (c), one arm part and a joint part are comprised from the joint part which has a rotating shaft in a box-shaped arm part. That is, for example, the box-shaped arm portion 104 and the joint portion a2 have a configuration in which a joint portion a2 having a rotation axis is provided in the vicinity of the end portion of the box-shaped arm portion 104.

  Here, the leaf springs S1 to S4 will be described. In addition, when showing arbitrary leaf | plate springs among leaf | plate springs S1-S4, it only calls the leaf | plate spring S and demonstrates. FIG. 14 is a view showing the structure of the leaf spring of this embodiment. As shown in FIG. 14, the leaf spring S of the present embodiment has a structure in which the cross section cs0 is curved, and the load is almost constant with respect to the bending in a range where the curved portion is bent beyond an angle that makes a straight line. Become. Thereby, even if a bending angle changes, a constant load will be applied.

  FIG. 15 is a diagram showing a cross-sectional shape when the leaf spring of this embodiment is bent in the convex direction. FIG. 15A shows a case where the leaf spring S is bent approximately 10 degrees or more in the convex surface direction. FIG. 15B shows a case where the leaf spring S is bent 90 degrees or more in the convex direction.

  As shown in FIG. 15A, when the leaf spring S is bent approximately 10 degrees or more in the convex direction, the curved cross section becomes a straight line at the bent position. Further, as shown in FIG. 15B, even if the leaf spring S is bent 90 degrees or more in the convex direction, the curved cross section remains a straight line at the bent position. That is, the curvature radius of the bent portion is the same when the bending angle in FIG. 15A is small and when the bending angle in FIG. 15B is large. That is, the radius of curvature of the bent portion is always constant.

  FIG. 16 is a diagram showing a cross-sectional shape when the leaf spring of this embodiment is bent in the concave direction. FIG. 16A shows a case where the leaf spring S is bent approximately 10 degrees or more in the concave direction. FIG. 16B shows a case where the leaf spring S is bent 90 degrees or more in the concave direction.

  FIG. 16 is similar to FIG. Specifically, as shown in FIG. 16A, when the leaf spring S is bent to approximately 10 degrees or more in the concave direction, the curved cross section becomes a straight line at the bent position. Furthermore, as shown in FIG. 16B, even if the leaf spring S is bent 90 degrees or more in the concave direction, the curved cross section remains a straight line at the bent position. That is, the curvature radius of the bent portion is the same when the bending angle in FIG. 16A is small and when the bending angle in FIG. 16B is large. That is, the radius of curvature of the bent portion is always constant.

  A restoring force F that tries to return when the plate spring S having a curved cross section is bent functions as a spring (see FIGS. 15 and 16). And the restoring force F is more dominant than the restoring force when the leaf spring S itself is bent, and the restoring force F when the portion where the cross section becomes straight when bent is to return to the curve.

  Accordingly, in a leaf spring having a straight section (planar leaf spring), the force generated when the leaf spring is bent is a restoring force in the direction in which the leaf spring is bent. A force is generated when the portion is bent by a restoring force F that attempts to return to the curved surface.

  The feature of the leaf spring having a curved cross section leads to a constant load even when the bending angle is changed. FIG. 17 is a diagram showing loads when the bending angle of the leaf spring of this embodiment is shallow and deep. FIG. 17 shows a state in which the bending angle of the leaf spring S becomes deeper from (a) to (c). In addition, when showing arbitrary joint parts among joint parts a1-a2, it is only called the joint part a and demonstrates.

  As shown in FIG. 17 (a), the plate spring S is wound around the rotation shaft of the joint portion a with one end of the plate spring S fixed by the fixing member E and the other end set as a free end. When turned and rotated, the cross section cs1 of the bent portion is a straight line, and the cross section cs2 immediately before the bend is curved. And let L be the length from the beginning of bending to the fixed end (fixed member E). Assuming that the force that restores the straight cross section cs1 to the curved cross section is the restoring force F, the rotational moment applied to the fixed end (fixing member E) is F · L.

  As shown in FIG. 17B, when the leaf spring S is further bent than in FIG. 17A, the section cs3 of the bent portion is a straight line, and the section cs4 just before the bending is curved. Even if the angle at which the leaf spring S is bent is changed, the restoring force F is a force to return the straight cross section cs3 to the curved cross section, and has the same value regardless of the bend angle. Accordingly, since the length L between the portion where the restoring force F is generated and the fixed end (fixing member E) does not change, the rotational moment in this case is F · L, which is the same as in FIG.

  Further, as shown in FIG. 17C, when the leaf spring S is bent further than in FIG. 17B, the cross section cs5 of the bent portion is a straight line, and the cross section cs6 just before the curve is curved. As described above, even if the angle at which the leaf spring S is bent is changed to a deeper angle, the restoring force F is a force for the straight cross section cs5 to return to the curved cross section, and is the same value regardless of the bend angle. . Accordingly, since the length L between the portion where the restoring force F is generated and the fixed end (fixing member E) does not change, the rotational moment in this case is F · L, which is the same as in FIG.

  By using the leaf spring S having a curved cross section, the force applied to the leaf spring S always shows the same value even if the bending angle of the leaf spring S changes. That is, the leaf spring S applies a constant load to the bending by the joint part a. The leaf spring S corresponds to the constant load load portion.

  Next, the detail at the time of attaching the leaf | plate spring S to the temple 100 of this embodiment is demonstrated. FIG. 18 is a view showing a cross-sectional structure in which a portion of the range V of the temple shown in FIG. In FIG. 18, the Y-shaped part of the temple 100 of the present embodiment is enlarged.

  In FIG. 18, one part composed of an arm part 104 and a joint part a2 is connected to another arm part 102 by a rotatable joint part a2. A curved leaf spring S2 is wound around the rotation axis of the joint a2. One end of the leaf spring S2 is fixed by a fixing member E2 in the vicinity of one end of the arm portion 104, and the other end is a free end. Further, a protruding stopper 1021 is provided so that the arm portion 104 does not open beyond a predetermined angle.

  In FIG. 18, when the arm portion 104 bends in the R direction along the shape of the head, the internal leaf spring S2 also bends, but the radius of curvature of the leaf spring S is constant, the rotation shaft of the joint portion a2, and the fixing member E2. Therefore, the load applied to the arm portion 104 is always constant by the same action as in FIG. For this reason, even if the shape of the head differs depending on individual differences, the load applied by the arm 104 to the head is constant, and the support of the temple 100 and the reduction of the load can be realized.

  The bending load when the leaf springs S1 to S4 shown in FIG. 13B are bent does not have to be the same. That is, according to the length of the arm part (arm part 102, 104, 106, 108) of each joint part (joint part a1-a4), it is in each contact point of contact point c1-c4 shown in FIG.8 (b). It is desirable to change the bending load so that the rotational moments of the respective arm portions do not become the same.

  As a method of changing the bending load of the leaf spring S, there is a method of changing the radius of curvature of the curved cross section of the leaf spring S for each joint portion in the case of plate materials having the same Young's modulus. As the radius of curvature of the leaf spring S is smaller, the restoring force becomes stronger and the bending load can be increased.

  As another method of changing the bending load of the leaf spring S, there is a method of changing the bending load by using members made of materials having different Young's moduli even though the curvature radius of the curved cross section is the same. The leaf spring S has a higher bending load as the Young's modulus is larger. As the member forming the leaf spring S, carbon tool steel, specifically, SK70, SK75, SK80, SK85, SK90, SK105 and the like are suitable. Stainless steel may also be used.

  The thickness of the leaf spring S having a curved cross section is suitably 0.1 mm to 0.3 mm. Further, the length of the leaf spring S depends on the length of each arm portion, but a range of approximately 30 mm to 60 mm is suitable. The width of the leaf spring S depends on the width of the temple, but a range of 2 mm to 6 mm is suitable. Further, the radius of curvature of the curved cross section of the leaf spring S is suitably in the range of 10 mm to 150 mm. As the longitudinal elastic modulus of the leaf spring S, a range of 90 N / mm2 to 200 N / mm2 is suitable.

  Thus, the temple 100 attached to the eyeglass-type display of the present embodiment has a Y-shape with a bendable articulated structure, and has a configuration in which a leaf spring S having a curved cross section is provided. As a result, even when the glasses-type display is mounted on the head having a different shape, the temple 100 abuts from the user's temple to the back of the head, and each joint portion (joint portions a1 to a4) is subjected to a constant load against bending. It is done. Therefore, the temple 100 can be brought into contact with the temple from the temple to the back of the head with a uniform load, and the load applied to the nose can be distributed to the side of the head, thereby greatly reducing the load on the nose. Therefore, it is possible to maintain the ease of attaching and detaching the eyeglass-type display and reduce the load on the nose and ears during wearing regardless of individual differences in the head shape.

  In the present embodiment, a leaf spring S having a curved cross section is provided as the constant load load portion. The Y-shaped temple 100 having a multi-joint structure has a configuration in which the curvature radius of the curved cross section of the leaf spring is different for each joint portion, or a configuration in which the longitudinal elastic modulus of a member forming the leaf spring S is different for each joint portion. It has become. Thereby, even if it is a head from which a shape differs, while being able to apply a constant load to the contact point of a temporal head with a simple and lightweight means, temple 100 can be created cheaply and lightweight.

  Next, description will be given of an example in which a spectacle-type display to which the temple 100 of this embodiment is attached is actually attached. First, a comparative example which is a comparison target of the example is shown, and then the example is described.

<Configuration of glasses-type display>
The eyeglass-type displays of this example and the comparative example are binocular types and weigh 80 g. And the image display part 30 (refer FIG. 1, 2) has the optical waveguide 32 made from a transparent acrylic resin which has arrange | positioned the triangular prism at both ends. In the image projection optical unit 20 (see FIGS. 1 and 2), the light source 22 is an LED, and has a 0.44 inch liquid crystal panel 24.

  In addition, an information processing apparatus different from the glasses-type display main body is connected via a signal line. Then, drive signals based on various types of information are transmitted from the information processing apparatus to the image projection optical unit 20 and the image display unit 30 via signal lines. Further, the right temple has a Y-shaped multi-joint structure as shown in FIG. 13B, and the left temple has a symmetrical structure with the right temple.

  Each part of the temple 100 having a rotatable joint portion and an arm portion is made of ABS resin having a thickness of 1 mm, a box-shaped arm having an outer height of 10 mm and an outer width of 3.5 mm, and a joint having a rotation shaft of φ1 mm. Consists of parts. The length of the arm part of each part is 57 mm for the arm part 102 shown in FIG. 13B, 21 mm for the arm part 104, 22 mm for the arm part 106, and 25 mm for the arm part 108. The center of gravity was 15 mm from the front end of the glasses-type display.

(Comparative example)
In the comparative example, a flat leaf spring was wound around each joint portion of the temple as a constant load spring along the rotation axis. The spring constant of each leaf spring is 1 N · mm / deg for the joint part a 1, 0.1 N · mm / deg for the joint part a 2, 0.3 N · mm / deg for the joint part a 3, and 0.5 N · for the joint part a 4. It was designed to be mm / deg. Carbon tool steel SK90 was used for all members forming the leaf spring.

<Result>
When the above-mentioned prototype temple is connected to the eyeglass-type display body, the head shape is reproduced based on the average adult male head shape dimensions (standard shape), and the small 10% shape (10% smaller shape) ) And 10% shape is large (10% larger shape), each human body model is manufactured, a spectacle-type display having a prototype temple is attached, and the contact points c1, c2, A pressure-sensitive sensor was attached to the measurement points c3 and c4, and the load applied to the head at each contact point was measured.

  In FIG. 12, the measurement result of the load concerning the head at the time of using the temple of a comparative example is shown. As shown in FIG. 12, in the standard head shape, the load at each contact point (contact points c1, c2, c3, c4) is uniform at about 0.2N. On the other hand, when the head shape is 10% smaller, the overall contact of the temple with the head is weak. In the case of a shape that is 10% larger, the load at the temple position (contact point c1) is near 0.35 N, and discomfort or pain may occur near the temple when worn for a long time.

  Next, the load on the nose of the glasses-type display will be described. FIG. 19 is a diagram illustrating a load on the nose of the glasses-type display in the comparative example. As shown in FIG. 19, the load on the nose in each head shape is reduced by about 90% compared to the conventional temple in the standard shape and a shape that is 10% larger, but in the shape that is 10% smaller, the load on the nose. The reduction was about 50%, and the effect was weak.

Example 1
In Example 1, a leaf spring having a curved cross section was used as a constant load spring for each joint portion of the temple. FIG. 20 shows information related to the leaf spring used in the first embodiment. By the design based on FIG. 20, the spring constant of the leaf spring of each joint part (joint part a1, a2, a3, a4) in FIG. 8B is 27N · mm for the joint part a1 and 10N · mm for the joint part a2. The joint a3 is set to 11 N · mm, and the joint a4 is set to 12 N · mm. That is, in the leaf spring of Example 1, only the radius of curvature of the cross section is changed at each joint. Carbon member steel SK75 was used for all members forming the leaf spring.

<Result>
Similar to Comparative Example 1, the prototype temple described above is connected to the eyeglass-type display body, and the head shape is reproduced based on the average adult male head shape dimensions (standard shape), and the 10% shape Figure 8 (b) shows the positional relationship shown in Fig. 8 (b). Each human body model is manufactured for a small case (10% small shape) and a large 10% shape (10% large shape), and a glasses-type display with a prototype temple is attached. Pressure sensors were attached to the measurement points of the contact points c1, c2, c3, and c4, and the load applied to the head at each contact point was measured.

  FIG. 21 is a diagram illustrating a measurement result of a load applied to the head when the temple of Example 1 is used. As shown in FIG. 21, in Example 1, regardless of whether the shape of the head is a standard shape, a shape that is 10% smaller, or a shape that is 10% larger, the load from the temple on the head is the same at any contact point. It was confirmed that both were about 0.2N. With a load of about 0.2 N, even when worn for 2 to 3 hours, there is no feeling of tightening or pain on the head.

  Next, the load on the nose of the glasses-type display will be described. FIG. 22 is a diagram illustrating a load on the nose of the eyeglass-type display according to the first embodiment. As shown in FIG. 22, it was confirmed that the load on the nose in each head shape was reduced by about 90% compared to the conventional temple, regardless of the head shape.

(Example 2)
In Example 2, a leaf spring having a curved cross section was used as a constant load spring for each joint portion of the temple. FIG. 23 shows information related to the leaf spring used in the second embodiment. With the design based on FIG. 23, the spring constant of the leaf spring of each joint part (joint part a1, a2, a3, a4) of FIG. 8B is 27N · mm for the joint part a1 and 10N · mm for the joint part a2. The joint a3 is set to 11 N · mm, and the joint a4 is set to 12 N · mm. That is, in the leaf spring of Example 2, only the longitudinal elastic modulus is changed at each joint. Carbon member steel SK75 was used for all members forming the leaf spring.

<Result>
Similar to Comparative Example 1, the prototype temple described above is connected to the eyeglass-type display body, and the head shape is reproduced based on the average adult male head shape dimensions (standard shape), and the 10% shape Figure 8 (b) shows the positional relationship shown in Fig. 8 (b). Each human body model is manufactured for a small case (10% small shape) and a large 10% shape (10% large shape), and a glasses-type display with a prototype temple is attached. Pressure sensors were attached to the measurement points of the contact points c1, c2, c3, and c4, and the load applied to the head at each contact point was measured.

  FIG. 24 is a diagram illustrating a measurement result of a load applied to the head when the temple of Example 2 is used. As shown in FIG. 24, in Example 2, regardless of whether the shape of the head is a standard shape, a shape that is 10% smaller, or a shape that is 10% larger, the load from the temple on the head is the same at any contact point. It was confirmed that both were about 0.2N. With a load of about 0.2 N, even when worn for 2 to 3 hours, there is no feeling of tightening or pain on the head.

  Next, the load on the nose of the glasses-type display will be described. FIG. 25 is a diagram illustrating a load on the nose of the glasses-type display according to the second embodiment. As shown in FIG. 25, it was confirmed that the load on the nose in each head shape was reduced by about 90% compared to the conventional temple, regardless of the head shape.

1, 2, 3 Head 10 Eyeglass-type display 20 Image projection optical unit 22 Light source 24 Liquid crystal panel 26 Optical lens group 30 Image display unit 32 Optical waveguide 40 Case 50, 100 Temple 60 Nose pad 70 Ear pad 102, 104, 106 , 108 Arm part 112, 114, 116, 118 Angle fixing member 1021 Stopper a1, a2, a3, a4 Joint part c1, c2, c3, c4 Contact point cs0, cs1, cs2, cs3, cs4, cs5, cs6 Cross section E, E2 fixing member S (S1, S2, S3, S4) leaf spring

Japanese Patent No. 4985247 Japanese Patent No. 4595604

Claims (5)

An image display unit for displaying an image;
A support member that supports the image display unit in front of the user's eyes when worn by the user;
One end is connected to the support member, and a pair of left and right temples provided at a predetermined interval, and
The temple includes a plurality of joint portions, a plurality of arm portions connected by the joint portions, and a plurality of constant load load portions that apply a constant load to the bending by the joint portions.   The display device according to claim 1, wherein the temple has a Y shape and abuts from the vicinity of the user's temple to the vicinity of the back of the head.   The display device according to claim 1, wherein the constant load load portion is a leaf spring having a curved cross section.   The display device according to claim 3, wherein the temple has a radius of curvature of a curved cross section of the leaf spring for each joint portion.   The display device according to claim 3, wherein the temple has a different longitudinal elastic coefficient of a member forming the leaf spring for each joint portion.